Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3701
Stride
LRN
$3.19B
| $461K | ﹤0.01% |
5,351
-84
| -2% | -$7.72K |
|
3702
New Oriental
EDU
$8.66B
| $461K | ﹤0.01% |
10,046
-26
| -0.3% | -$1.32K |
|
|
NAK
3703
PUT
Northern Dynasty Minerals
NAK
$821M
| $461K | ﹤0.01% |
239,900
+32,900
| +16% | +$66K |
|
|
HIMX
3704
PUT
Himax Technologies
HIMX
$2.43B
| $460K | ﹤0.01% |
30,000
+14,800
| +97% | +$230K |
|
3705
PUT
Pinnacle West Capital
PNW
$11.1B
| $460K | ﹤0.01% |
4,300
+800
| +23% | +$81.8K |
|
3706
PUT
Manhattan Associates
MANH
$11.8B
| $460K | ﹤0.01% |
3,300
+3,100
| +1,550% | +$427K |
|
3707
CALL
InfraCap MLP ETF
AMZA
$465M
| $459K | ﹤0.01% |
20,400
+3,900
| +24% | +$180K |
|
3708
PUT
Frontier Group Holdings
ULCC
$1.4B
| $459K | ﹤0.01% |
58,000
+51,200
| +753% | +$264K |
|
3709
CALL
Upexi
UPXI
$97.7M
| $459K | ﹤0.01% |
584,900
+105,500
| +22% | +$123K |
|
3710
PUT
Compass
COMP
$6.99B
| $459K | ﹤0.01% |
37,200
-59,200
| -61% | -$493K |
|
3711
Guardant Health
GH
$23.8B
| $458K | ﹤0.01% |
+3,056
| New | +$332K |
|
3712
CALL
Bank OZK
OZK
$5.08B
| $458K | ﹤0.01% |
8,800
-14,300
| -62% | -$696K |
|
|
HAPN
3713
CALL
Happen Inc
HAPN
$1.72B
| $458K | ﹤0.01% |
22,100
-3,000
| -12% | -$51.1K |
|
3714
PUT
Matador Resources
MTDR
$6.37B
| $458K | ﹤0.01% |
9,200
-9,200
| -50% | -$523K |
|
|
XE
3715
X-Energy Inc
XE
$4.15B
| $458K | ﹤0.01% |
+24,941
| New | +$646K |
|
3716
Park Aerospace
PKE
$648M
| $458K | ﹤0.01% |
11,995
+10,495
| +700% | +$349K |
|
3717
Ligand Pharmaceuticals
LGND
$6.26B
| $457K | ﹤0.01% |
+1,446
| New | +$341K |
|
3718
CALL
Signet Jewelers
SIG
$3.96B
| $457K | ﹤0.01% |
5,300
-10,000
| -65% | -$864K |
|
|
ONT
3719
PUT
Onterris Inc
ONT
$514M
| $457K | ﹤0.01% |
+22,600
| New | +$422K |
|
3720
PUT
Camtek
CAMT
$6.66B
| $457K | ﹤0.01% |
2,800
-36,500
| -93% | -$6.47M |
|
3721
PUT
OneWater Marine
ONEW
$163M
| $456K | ﹤0.01% |
40,500
| – | – |
|
3722
PUT
Brighthouse Financial
BHF
$2.99B
| $456K | ﹤0.01% |
7,200
-5,500
| -43% | -$342K |
|
3723
Ingersoll Rand
IR
$29.6B
| $455K | ﹤0.01% |
+5,550
| New | +$429K |
|
3724
PUT
Rayonier Advanced Materials
RYAM
$551M
| $454K | ﹤0.01% |
57,800
-118,700
| -67% | -$1.08M |
|
3725
CALL
NGL Energy Partners
NGL
$1.86B
| $454K | ﹤0.01% |
28,500
-6,700
| -19% | -$104K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.